Please contact the instructor who created assignments for you to check the Turnitin assignment settings options. The ‘store paper in repository’ option should be switched off, so that it does not show any match no matter how many times you submit it.
And a request will be sent to the Turnitin administrator from your instructor. Turnitin administrator will then review the request and approve it if they agree the paper should be deleted.
For more information please visit the following website.
Reply unit： Reference Services